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@pact-foundation

Pact Foundation

The cross-language distributed contract testing framework.
README.md

Pact

Pact is the de-facto API contract testing tool. Replace expensive and brittle end-to-end integration tests with fast, reliable and easy to debug unit tests.
  • ⚡ Lightning fast
  • 🎈 Effortless full-stack integration testing - from the front-end to the back-end
  • 🔌 Supports HTTP/REST and event-driven systems
  • 🛠️ Configurable mock server
  • 😌 Powerful matching rules prevents brittle tests
  • 🤝 Integrates with Pact Broker / PactFlow for powerful CI/CD workflows
  • 🔡 Supports 12+ languages

Why use Pact? Contract testing with Pact lets you:

  • ⚡ Test locally
  • 🚀 Deploy faster
  • ⬇️ Reduce the lead time for change
  • 💰 Reduce the cost of API integration testing
  • 💥 Prevent breaking changes
  • 🔎 Understand your system usage
  • 📃 Document your APIs for free
  • 🗄 Remove the need for complex data fixtures
  • 🤷‍♂️ Reduce the reliance on complex test environments

Watch our series on the problems with end-to-end integrated tests, and how contract testing can help.

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  1. roadmap roadmap Public

    Developer Relations @ Pact - Your map to the Pact landscape for all-comers (maintainers, contributors, users, newbies)

    44 7

  2. pact-specification pact-specification Public

    Describes the pact format and verification specifications

    315 29

  3. pact-reference pact-reference Public

    Reference implementations for the pact specifications

    Rust 101 51

  4. pact_broker pact_broker Public

    Enables your consumer driven contracts workflow

    Ruby 742 186

  5. pact-core-mock-server pact-core-mock-server Public

    In-process mock server for matching HTTP requests and generating responses from a pact file

    Rust 10 2

  6. pact-js pact-js Public

    JS version of Pact. Pact is a contract testing framework for HTTP APIs and non-HTTP asynchronous messaging systems.

    TypeScript 1.8k 351

Repositories

Showing 10 of 86 repositories
  • pact-python Public

    Python version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.

    pact-foundation/pact-python’s past year of commit activity
    Python 663 MIT 147 14 (1 issue needs help) 5 Updated Apr 19, 2026
  • pact-5-minute-getting-started-guide Public template
    pact-foundation/pact-5-minute-getting-started-guide’s past year of commit activity
    JavaScript 18 584 1 4 Updated Apr 19, 2026
  • pact-workshop-message Public

    collection of pact message workshops in various languages

    pact-foundation/pact-workshop-message’s past year of commit activity
    Makefile 0 0 3 10 Updated Apr 19, 2026
  • pact_broker Public

    Enables your consumer driven contracts workflow

    pact-foundation/pact_broker’s past year of commit activity
    Ruby 742 MIT 186 99 (1 issue needs help) 18 Updated Apr 19, 2026
  • pact-broker-docker Public

    Dockerized Pact Broker

    pact-foundation/pact-broker-docker’s past year of commit activity
    Shell 115 MIT 112 2 11 Updated Apr 19, 2026
  • pact-standalone Public

    Standalone Amalgamated Pact CLI - Broker Client / Mock Server / Provider Verifier / Stub Server / Plugin

    pact-foundation/pact-standalone’s past year of commit activity
    Shell 44 MIT 36 2 (2 issues need help) 8 Updated Apr 19, 2026
  • pact-php Public

    PHP version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project

    pact-foundation/pact-php’s past year of commit activity
    PHP 299 Apache-2.0 91 2 3 Updated Apr 19, 2026
  • pact-js Public

    JS version of Pact. Pact is a contract testing framework for HTTP APIs and non-HTTP asynchronous messaging systems.

    pact-foundation/pact-js’s past year of commit activity
    TypeScript 1,758 351 98 (13 issues need help) 30 Updated Apr 18, 2026
  • pact-workshop-dotnet Public
    pact-foundation/pact-workshop-dotnet’s past year of commit activity
    C# 9 Apache-2.0 3 1 0 Updated Apr 17, 2026
  • docs.pact.io Public

    Pact documentation website

    pact-foundation/docs.pact.io’s past year of commit activity
    HTML 17 106 18 (2 issues need help) 13 Updated Apr 17, 2026
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